Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 162 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.100 decreased by 8% =
2. 2.125 decreased by 8% =
3. 3.520 increased by 15% =
4. 4.506 increased by 50% =
5. 5.80 decreased by 30% =
6. 6.356 decreased by 75% =
7. 7.260 decreased by 20% =
8. 8.275 decreased by 12% =
9. 9.600 increased by 12% =
10. 10.180 decreased by 10% =
11. 11.564 decreased by 50% =
12. 12.355 decreased by 40% =
13. 13.655 decreased by 40% =
14. 14.100 increased by 15% =
15. 15.260 decreased by 40% =
16. 16.594 decreased by 50% =
17. 17.200 increased by 10% =
18. 18.430 decreased by 30% =
19. 19.525 decreased by 12% =
20. 20.740 increased by 5% =
21. 21.675 increased by 12% =
22. 22.550 decreased by 8% =
23. 23.260 increased by 5% =
24. 24.456 increased by 25% =
25. 25.636 increased by 75% =
26. 26.40 increased by 35% =
27. 27.648 decreased by 25% =
28. 28.516 increased by 75% =
29. 29.720 increased by 35% =
30. 30.136 increased by 75% =
31. 31.175 increased by 8% =
32. 32.605 increased by 60% =
33. 33.220 increased by 5% =
34. 34.485 increased by 60% =
35. 35.480 increased by 20% =
36. 36.105 decreased by 20% =
37. 37.740 decreased by 15% =
38. 38.720 increased by 75% =
39. 39.200 decreased by 15% =
40. 40.40 decreased by 10% =

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